Continuity mistake: In this episode Pam and Jim are talking about how Jim used to have a crush on Pam when she first started here. This implies that Jim was working here when Pam was hired. However, in 4-3: Launch Party Pam says that when Jim first started working there she said, "Enjoy this moment, because you're never going to back to this time before you met your desk-mate, Dwight." These two scenes contradict each other.
Continuity mistake: After everyone but Dwight and Kelly exit the building (because of the fire), Dwight picks up the water jug and accidentally knocks over the blue cups next to it. A few cups fall to the floor but one remains still on the printer (next to where the jug was). After Dwight gets Kelly out of the kitchen, the blue cup has disappeared from the printer.